That shows you every article that makes the front page, it does not show you articles that people have just submitted. An RSS feed for all submissions might be nice, but refreshing the new page every 30 minutes or so is also sufficient. Since they roll down in order you don't lose your place, but the front page articles "jump" into whatever place the algorithm determines, which is why I prefer to read the front page via RSS.
The RSS shows every submission which gets at least one up vote. So most spam doesn't make it to the RSS, but a lot of other cruft can pass through depending on if at least one person liked it.
I disagree here Shamiq, from my experience that's not entirely accurate. Typically 4-5 votes makes front page - though yo uare correct, often 2-3 votes is sufficient. Sometimes 2 votes will, but not always - it's more a function (I believe) of how much front page upvoting is going on at the time.
